Add Apptronik Apollo humanoid

Author: stephane-caron

README.md

@@ -133,6 +133,7 @@ A curated list of awesome robot descriptions in URDF, Xacro or MJCF formats.
 
 | Name | Maker | Formats | License | Visuals | Inertias | Collisions |
 |------|-------|---------|---------|---------|----------|------------|
+| Apollo | Apptronik | [MJCF](https://github.com/google-deepmind/mujoco_menagerie/tree/main/apptronik_apollo) | Apache-2.0 | ✔️ | ✔️ | ✔️ |
 | Atlas DRC (v3) | Boston Dynamics | [URDF](https://github.com/RobotLocomotion/models/blob/master/atlas/atlas_convex_hull.urdf) | BSD-3-Clause | ✔️ | ✔️ | ✔️ |
 | Atlas v4 | Boston Dynamics | [URDF](https://github.com/openai/roboschool/tree/1.0.49/roboschool/models_robot/atlas_description) | MIT | ✔️ | ✔️ | ✔️ |
 | Berkeley Humanoid | Hybrid Robotics | [URDF](https://github.com/HybridRobotics/berkeley_humanoid_description) | BSD-3-Clause | ✔️ | ✔️ | ✔️ |